The invention discloses oxygen supply type landscape special fertilizer for degrading a chromium element in soil. The oxygen supply type landscape special fertilizer are prepared from raw materials of dry marsh mud, peat, a rapeseed cake, a mushroom residue, manioc waste, pine sawdust, a modified oxygenating agent, a modified degrading agent, a modified slow release agent, monoammonium phosphate, potassium fulvate, ammonium chloride, ammonium dibasic phosphate, ferrous sulfate, zinc sulfate, ammonium molybdate, compound ammonium nitrate, ammonia sulfate, stannous chloride, sodium hydrogen sulfite, sodium borate, vermiculite, lime powder, kaolin powder and diatomite. The landscape special fertilizer provided by the invention can degrade the chromium element in the soil; the enrichment effect of the chromium element can be avoided; further, the sufficient oxygen can be provided for the growth of a landscape crop; the growth of the landscape crop is promoted.